Agustín Sienra
| Personal information | |||
|---|---|---|---|
| Date of birth | 14 July 1999 | ||
| Place of birth | Capitán Bermúdez, Argentina | ||
| Height | 1.85 m (6 ft 1 in) | ||
| Position | Centre-back | ||
| Team information | |||
Current team | Castellón | ||
| Number | 4 | ||
| Youth career | |||
| Defensores Santa Catalina | |||
| Newell's Old Boys | |||
| 2016–2020 | Defensa y Justicia | ||
| Senior career* | |||
| Years | Team | Apps | (Gls) |
| 2020–2025 | Defensa y Justicia | 5 | (0) |
| 2021–2022 | → Villa San Carlos (loan) | 31 | (0) |
| 2023–2024 | → San Martín de San Juan (loan) | 51 | (0) |
| 2025– | Castellón | 13 | (1) |
| * Club domestic league appearances and goals as of 3 January 2026 | |||
Agustín Sienra (born 14 July 1999) is an Argentine professional footballer who plays as a centre-back for Spanish club CD Castellón.